fix: nightly clippy

compilers/concrete-optimizer/concrete-optimizer/src/computing_cost/operators/keyswitch_lwe.rs

@@ -6,12 +6,12 @@ pub struct KsComplexity;
 
 impl KsComplexity {
     #[allow(clippy::cast_possible_wrap)]
+    #[allow(clippy::unused_self)]
     pub fn complexity(
         &self,
         params: KeyswitchParameters,
         _ciphertext_modulus_log: u32,
     ) -> Complexity {
-        _ = self;
         // https://github.com/zama-ai/concrete-optimizer/blob/prototype/python/optimizer/noise_formulas/keyswitch.py#L91
         let input_lwe_dimension = params.input_lwe_dimension.0 as i64;
         let output_lwe_dimension = params.output_lwe_dimension.0 as i64;

compilers/concrete-optimizer/concrete-optimizer/src/utils/cache/persistent.rs

@@ -113,7 +113,6 @@ where
         let content = update(content);
         let len_after = content.len();
         *lock = Arc::new(content);
-        drop(lock);
         if len_before != len_after {
             self.content_changed.store(true, Ordering::Relaxed);
         }